Earlier quoted context omitted.
> Healthcare is best managed as a risk pool. No, health insurance is best managed as a risk pool, which, as you say, should obviously be everyone. But much of health care is not health insurance because it doesn't deal with insurable risks. Your need to get an annual physical isn't an insurable risk. Neither is a one-time appointment with a doctor to see if your headache and runny nose is just a cold or an infection…
While this may make sense from the perspective of why people get insurance (to mitigate a catastrophic loss), it doesn't consider the insurer's incentives. No insurance company will want to underwrite a plan that doesn't bundle routine services, since those clearly reduce risk of complications down the road. A yearly checkup is cheap compared to missing a disease and letting it get worse.
So I would suggest that prevention is not necessarily cheaper than the cure for insurance companies, and largely their health programs like free checkups or fitness coupons are just marketing.